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(No Model.)

A. SANDOZ.

STEM WINDING WATCH. No. 326,677. Patented Sept. 22, 1885.

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UNITED STATES PATENT OFFICE.

AUGUSTE SANDOZ, OF NEUCHATEL, SVITZERLAND.

STEM-WINDING WATCH.

SPECIFICATION forming part of Letters Patent No. 326,677, dated September 22, 1885.

Application filed May 18, i855. (No model.)

To all whom, it ntcty concern,.-

Be it known that I, AUGUSTE SANDoz, director of the watch-niaker school of Neuchatel, Switzerland,have invented a new and useful Improvement in Stem-finding Vatches, of which the following is a specification.

My invention relates to a stemwinding mechanism of great simplicity and of much greater strength than the devices heretofore in use. Its working is very reliable.

In the accompanying drawings, Figure l shows a plan view of my stenrwinding mechanism with section through x y, and Fig. 2 a section through U W of the same.

The stem D is retained in the pendant by means of a screw, a, and its pivot d turns in the bridge E. On a squared part of the stein D slides a pinion, C, with click-teeth. The barrel B of the watch is placed in such a manner as to bring the beveled or clicktoothed wheel A, fixed on the arbor of the barrel, in gear with the pinion C, also provided with click-teeth. i A spring, F,xed to the bridge E by means of screwsff, presses the pinion C against wheel A, and allows the same to work as a click when the stem is turned backward. A click, I, acted upon by a spring, J, prevents the arbor ofthe barrel B turning backward under the influence of the mainspring. The wheel A being of a 35 Having thus described my invention, what I claim is- The co1nbination,with the barrel B` its shaft and spring, of the wheel A, secured to said shaft and havinginclined teeth, aspring-click 4o to keep the wheel A and barrel from turning backward, the winding-stein D and crown, the clickpinion @,tted to slide on a squared portion oi' said stem and having teeth inclined in 'the opposite direction lo those ofthe wheel A, 45

and the spring F, for keeping the pinion Cin gear with the wheel A, whereby when the stem and pinion are turned in one direction the wheel A is revolved and the spring wound up, and when turned in the other direction pinion rides over the teeth of A without turning said wheel A, substantially as and for the purposes sct forth.

Signed by me this 29th day of April, A. D. 1885.

AUGUSTE SANDOZ. [L s] Witnesses:

CHARLES NEFF, ELMER SCHNEIDER.

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